By Jon Wertheim In our latest mailbag, we look at the changing coverage of the tournament. As it is written… Wednesday is Mailbag Day… Some thoughts on Serena Williams and her contributions to tennis/sports/culture. Onward… MailbagThis is a completely impressionistic response, but as someone now of a certain age I can’t recall such little media coverage of men’s Wimbledon perhaps since 1973 and the ATP player boycott (when Kodes ultimately beat Metreveli, who was from the U.S.S.R. but perhaps Georgian, if I recall), and then as now the attention was mostly on who wasn’t there. I’m not sure, …